diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index 7563f36c71db..fcacb186a67b 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -6,8 +6,7 @@ obj-$(CONFIG_OF_PROMTREE) += pdt.o
 obj-$(CONFIG_OF_ADDRESS)  += address.o
 obj-$(CONFIG_OF_IRQ)    += irq.o
 obj-$(CONFIG_OF_NET)	+= of_net.o
-obj-$(CONFIG_OF_UNITTEST) += of_unittest.o
-of_unittest-objs := unittest.o unittest-data/testcases.dtb.o
+obj-$(CONFIG_OF_UNITTEST) += unittest.o
 obj-$(CONFIG_OF_MDIO)	+= of_mdio.o
 obj-$(CONFIG_OF_PCI)	+= of_pci.o
 obj-$(CONFIG_OF_PCI_IRQ)  += of_pci_irq.o
@@ -16,5 +15,7 @@ obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
 obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
 
+obj-$(CONFIG_OF_UNITTEST) += unittest-data/
+
 CFLAGS_fdt.o = -I$(src)/../../scripts/dtc/libfdt
 CFLAGS_fdt_address.o = -I$(src)/../../scripts/dtc/libfdt
diff --git a/drivers/of/unittest-data/.gitignore b/drivers/of/unittest-data/.gitignore
new file mode 100644
index 000000000000..4b3cf8b16de2
--- /dev/null
+++ b/drivers/of/unittest-data/.gitignore
@@ -0,0 +1,2 @@
+testcases.dtb
+testcases.dtb.S
diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
new file mode 100644
index 000000000000..1ac5cc01d627
--- /dev/null
+++ b/drivers/of/unittest-data/Makefile
@@ -0,0 +1,7 @@
+obj-y += testcases.dtb.o
+
+targets += testcases.dtb testcases.dtb.S
+
+.SECONDARY: \
+	$(obj)/testcases.dtb.S \
+	$(obj)/testcases.dtb